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1 Purpose

E05JJF is used to get the value of an ‘ON’/‘OFF’-valued character E05JBF optional parameter. E05JJF can be used before or after calling E05JBF, but the initialization routine E05JAFmust have been called before calling E05JJF.

On entry: the dimension of the array COMM as declared in the (sub)program from which E05JJF is called.

Constraint:
LCOMM≥100.

5: IFAIL – INTEGERInput/Output

On entry: IFAIL must be set to 0, -1​ or ​1. If you are unfamiliar with this parameter you should refer to Section 3.3 in the Essential Introduction for details.

For environments where it might be inappropriate to halt program execution when an error is detected, the value -1​ or ​1 is recommended. If the output of error messages is undesirable, then the value 1 is recommended. Otherwise, if you are not familiar with this parameter, the recommended value is 0. When the value -1​ or ​1 is used it is essential to test the value of IFAIL on exit.

On exit: IFAIL=0 unless the routine detects an error or a warning has been flagged (see Section 6).

6 Error Indicators and Warnings

If on entry IFAIL=0 or -1, explanatory error messages are output on the current error message unit (as defined by X04AAF).